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A crystalline solid X reacts with dil HC...

A crystalline solid X reacts with dil HCI to liberate a gas Y. Y decolourises acidified KMnO4. When a gas 'Z' is slowly passed into an aqueous solution of Y, colloidal sulphur is obtained. X and Z could be, respectively

A

`Na_(2)S. SO_(3)`

B

`Na_(2)SO_(4). H_(2)S`

C

`Na_(2)SO_(3). H_(2)S`

D

`Na_(2)SO_(4), SO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`NaSO_(3) (2) + 2HCl to 2NaCl + SO_(2)(g) + H_(2)O`
`H_(2)O + SO_(2)(g) tounderset("Sulphurous acid Aqueous solution of Y") (H_(2)SO_(3)(aq))`
`H_(2)SO_(3) +2H_(2)S(g ) to underset("colloidal")(3S + 3H_(2)O)`
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